Charge carrier dynamics in PffBT4T-2OD: PCBM organic solar cells

Ramakant Sharma, Vinay Gupta, Hyunwoo Lee, Kunal Borse, Ram Datt, Chhavi Sharma, Mahesh Kumar, Seunghyup Yoo, Dipti Gupta

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


We investigate the charge carrier dynamics of inverted organic solar cells (OSCs) based on PffBT4T-2OD: PCBM and PTB7: PCBM – the two leading systems among the OSCs based on polymer-fullerene bulk-heterojunction – to elucidate the origin of their performance difference. Transient absorption spectroscopy (TAS) and photo-electrochemical impedance spectroscopy (photo-EIS) were employed to unravel the photo-physics that govern the cell operation of these two highly efficient bulk heterojunction OSCs. While photo-EIS indicates that the two systems under study exhibit similar behavior in terms of recombination, TAS results reveal that PffBT4T-2OD: PCBM systems not only have higher charge generation rate but also more efficient charge transfer than PTB7: PCBM systems, leading to the power conversion efficiency of PffBT4T-2OD: PCBM-based OSCs (9.16%) that is higher than that of PTB7: PCBM-based OSCs (6.44%).

Original languageBritish English
Pages (from-to)441-447
Number of pages7
JournalOrganic Electronics
StatePublished - Nov 2018


  • Electrochemical impedance spectroscopy
  • Organic solar cells
  • PCBM
  • PCBM
  • PffBT4T-2OD
  • PTB7
  • Transient absorption spectroscopy


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